88 lines
2.2 KiB
Plaintext
88 lines
2.2 KiB
Plaintext
/**
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* Is.js
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*
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* Object type checks.
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*/
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const NAME = Symbol.toStringTag;
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/**
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* Check if `obj` is a URLSearchParams object
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* ref: https://github.com/node-fetch/node-fetch/issues/296#issuecomment-307598143
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* @param {*} object - Object to check for
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* @return {boolean}
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*/
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export const isURLSearchParameters = object => {
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return (
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typeof object === 'object' &&
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typeof object.append === 'function' &&
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typeof object.delete === 'function' &&
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typeof object.get === 'function' &&
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typeof object.getAll === 'function' &&
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typeof object.has === 'function' &&
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typeof object.set === 'function' &&
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typeof object.sort === 'function' &&
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object[NAME] === 'URLSearchParams'
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);
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};
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/**
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* Check if `object` is a W3C `Blob` object (which `File` inherits from)
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* @param {*} object - Object to check for
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* @return {boolean}
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*/
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export const isBlob = object => {
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return (
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object &&
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typeof object === 'object' &&
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typeof object.arrayBuffer === 'function' &&
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typeof object.type === 'string' &&
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typeof object.stream === 'function' &&
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typeof object.constructor === 'function' &&
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/^(Blob|File)$/.test(object[NAME])
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);
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};
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/**
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* Check if `obj` is an instance of AbortSignal.
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* @param {*} object - Object to check for
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* @return {boolean}
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*/
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export const isAbortSignal = object => {
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return (
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typeof object === 'object' && (
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object[NAME] === 'AbortSignal' ||
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object[NAME] === 'EventTarget'
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)
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);
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};
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/**
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* isDomainOrSubdomain reports whether sub is a subdomain (or exact match) of
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* the parent domain.
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*
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* Both domains must already be in canonical form.
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* @param {string|URL} original
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* @param {string|URL} destination
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*/
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export const isDomainOrSubdomain = (destination, original) => {
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const orig = new URL(original).hostname;
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const dest = new URL(destination).hostname;
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return orig === dest || orig.endsWith(`.${dest}`);
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};
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/**
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* isSameProtocol reports whether the two provided URLs use the same protocol.
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*
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* Both domains must already be in canonical form.
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* @param {string|URL} original
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* @param {string|URL} destination
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*/
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export const isSameProtocol = (destination, original) => {
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const orig = new URL(original).protocol;
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const dest = new URL(destination).protocol;
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return orig === dest;
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};
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